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Re: Offloading compilers' support libraries

On Fri, Feb 20, 2015 at 22:48:52 +0300, Ilya Verbin wrote:
> On Fri, Feb 20, 2015 at 18:05:01 +0300, Ilya Verbin wrote:
> > On Thu, Feb 19, 2015 at 13:17:37 +0100, Thomas Schwinge wrote:
> > > My asumption is that it is always safe to install non-native (that is
> > > cross) GCC installations into the same prefix.  (Which would resolve this
> > > problem of clashing file names for target and offloading compilers for
> > > good.)
> > > 
> > > So, the next question is, instead of this special handling, why can't we
> > > require the offloading compilers to always be configured as cross
> > > compilers?  Or, why is it a requirement that the intelmic offloading
> > > compiler is configured as a native compiler?
> > 
> > If I understand correctly, to build a cross compiler, we need to specify a path
> > to the target sysroot, even for x86_64-pc-linux-gnu to x86_64-intelmic-linux-gnu
> > cross.  Or is it possible to build a cross compiler without --with-sysroot ?
> To be precise, for the cross compiler we need to specify a path to
> --with-build-time-tools (rather than --with-sysroot).  The problem is that for
> Intel MIC there are no special as/ld/etc.  So, is there an elegant way to build
> a cross compiler with host's build time tools?

Probably one can build an offloading cross compiler as:
configure --target=x86_64-intelmic-linux-gnu --enable-as-accelerator-for=x86_64-pc-linux-gnu --with-build-time-tools=/usr/bin/

But I'm getting errors for such configuration :(

In file included from ../../../gcc/libgcc/gthr.h:148:0,
                 from ../../../gcc/libgcc/libgcov-interface.c:27:
./gthr-default.h:35:21: fatal error: pthread.h: No such file or directory
compilation terminated.
make[2]: *** [_gcov_dump.o] Error 1
make[2]: Leaving directory `/build/x86_64-intelmic-linux-gnu/libgcc'
make[1]: *** [all-target-libgcc] Error 2
make[1]: Leaving directory `/build'
make: *** [all] Error 2

I really want to remove the intelmicemul target, since there is no difference in
the compiler between real and emulated compilation for Intel MIC.  The only
difference is which is used by at run-time.

  -- Ilya

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